Efecto de variables de paisaje y de rodal sobre la diversidad de especies arbóreas en el sotobosque de plantaciones de Pinus taeda en la provincia de Misiones, Argentina

Abstract

Efecto de variables de paisaje y de rodal sobre la diversidad de especies arbóreas en el sotobosque de plantaciones de Pinus taeda en la provincia de Misiones, Argentina A total of 91 native tree species were found in the forest understory, and the most abundant were animal-dispersed tree species. The native tree composition of plantations understory was different from that of native forest. The similarity analysis revealed that old plantations were more similar to native forest than to young plantations. The canonical correspondence analysis (CCA) showed that previous land use was the variable with more influence on the understory composition, followed by the basal area and the distance to the native forest at the time of planting. Wind-dispersed and pioneer species were more associated with short distances to the native forest and lower basal area; whereas animal-dispersed and shade tolerant species were related to high basal area and previous land use.Results support the idea that forest plantations may represent a suitable environment for the development of native plants.

Native tree regeneration in native tree plantations: understanding the contribution of Araucaria angustifolia to biodiversity conservation in the threatened Atlantic Forest in Argentina

“…Few stands under 35 years old were available in the study site, but our results are clearly in agreement with the relationships between stand age and native tree establishment found in other studies (Keenan et al 1997;Barbosa et al 2009;Dummel & Pinazo 2013;Ritter et al 2018). Stands older than 30 years exhibit higher species richness and higher abundance of late secondary trees than younger stands, which were dominated by pioneer or early secondary trees.…”

“…We found that zoochory was the most frequent dispersal mode among the tree species in the araucaria plantations that we studied. This result supports the observations in other forest plantations in the study area (Barbosa et al 2009;Dummel & Pinazo 2013;Vespa et al 2014) as well as in other tropical and subtropical plantations (Denslow & Moermond 1985;Keenan et al 1999). However, the abundance of zoochoric tree species decreased with stand age and time since last logging.…”

“…This result supports the observations in other forest plantations in the study area (Barbosa et al . ; Dummel & Pinazo ; Vespa et al . ) as well as in other tropical and subtropical plantations (Denslow & Moermond ; Keenan et al .…”

“…For example, the diversity of different taxa is higher in native than in non-native tree plantations (Keenan et al 1999;Hartley 2002;Fonseca et al 2009). Stand age is also a relevant variable; greater native tree species richness and stem density have been found in older than in young plantations (Keenan et al 1997;Barbosa et al 2009;Dummel & Pinazo 2013;Ritter et al 2018). However, this relationship is not necessarily linear (Senbeta et al 2002) and can vary among species that have different requirements for regeneration (Keenan et al 1997;Lugo 1997;Parrotta et al 1997;Selwyn & Ganesan 2009).…”

Características del paisaje y su relación con la diversidad y estructura de la vegetación ribereña del sureste de México

“…Estas actividades han provocado pérdidas y cambios en la diversidad, estructura y dinámica en los ecosistemas ribereños (Yoshida y Oka, 2004;Richardson y Rejmánek, 2011), afectando sustancialmente los servicios ecosistémicos de las riberas (Naiman et al, 2000;Meli et al, 2017). En comunidades tropicales la diversidad y estructura de la vegetación varían a través del gradiente altitudinal (Acosta et al, 2008;García y Wollmann, 2012) y por el efecto de las actividades antropogénicas (Apan et al, 2002, Burton et al, 2005Sunil et al, 2010;Dummel y Pinazo, 2013), lo cual genera cambios en la comunidad de especies vegetales (Ramírez y Gutiérrez-Fonseca, 2016).…”